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Contributed by Richard B. Potts, B.A., Ph.D. „Human Evolution”. Microsoft Encarta Online Encyclopedia 2007. Arhivat din original la .Mentenanță CS1: Nume multiple: lista autorilor (link)
Contributed by Richard B. Potts, B.A., Ph.D. „Human Evolution”. Microsoft Encarta Online Encyclopedia 2007. Arhivat din original la .Mentenanță CS1: Nume multiple: lista autorilor (link)